org.bukkit.command.CommandException: Unhandled exception executing command 'xmail' in plugin xMail vALPHA
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:479)
	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)
	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)
	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.LinkageError: loader constraint violation: when resolving method "com.turt2live.xmail.event.XMailPreSendEvent.<init>(Lcom/turt2live/xmail/mail/Mail;)V" the class loader (instance of org/bukkit/plugin/java/PluginClassLoader) of the current class, com/turt2live/xmail/external/PHPServerConnection, and the class loader (instance of org/bukkit/plugin/java/PluginClassLoader) for resolved class, com/turt2live/xmail/event/XMailPreSendEvent, have different Class objects for the type e/xmail/mail/Mail;)V used in the signature
	at com.turt2live.xmail.external.PHPServerConnection.send(PHPServerConnection.java:154)
	at com.turt2live.xmail.commands.XMailCommandHandler.onCommand(XMailCommandHandler.java:168)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	... 12 more